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33.
CHALLENGE: LACK OF COARSE-LEVEL FEATURES
Down-sampling
Linear
Output
Classifiers only work well on coarse-scale feature maps
Nearly all computation has been done before getting a coarse feature
Fine-level features Mid-level features Coarse-level features
Down-sampling
Down-sampling
Input
Classifier Classifier Classifier

34.
SOLUTION: MULTI-SCALE ARCHITECTURE
Fine-level features
Mid-level features
Coarse-level features

35.
Fine-level features
Mid-level features
Coarse-level features
SOLUTION: MULTI-SCALE ARCHITECTURE